AUTHOR'S PREFACE TO THE THIRD EDITION.
In the six years that have passed since the appearance of the second edition I have continued to work at the book, and have made use of the new sources and investigations that have appeared during this period, as well as corrected and extended my account in many passages. Yet I have not found it necessary to make many changes in the second half of the work. The increase of about sixty pages is almost entirely in the first half.
Berlin, 31st December, 1893